Toroidal-type continuously variable transmission

Abstract

A toroidal-type continuously variable transmission, has: a casing; an input rotary shaft; a pair of input side disks each including an input side inner surface and respectively supported on the input rotary shaft; an output cylinder supported on the input rotary shaft; a pair of output side disks each including an output side inner respectively supported on the periphery of the output cylinder; an output rotation transmission member fixed to the outer peripheral surface of the middle portion of the output cylinder; support members interposed respectively between the input side inner surfaces and the output side inner surfaces; power rollers being contacted with the input side inner surfaces and the output side inner surfaces; and, a rolling bearing disposed between the input side inner surface and the output side inner surfaces and rotatably supporting the output cylinder.

1. A toroidal continuously variable transmission, comprising:
 a casing;  
 an input rotary shaft rotatably supported in the interior of the casing;  
 a pair of input side disks each including an input side inner surface having an arc-shaped section and respectively supported on the two portions of the input rotary shaft in such a manner that the respective input side inner surfaces are opposed to each other, the pair of input side disks being rotatable synchronously with the input rotary shaft;  
 an output cylinder supported on the periphery of the middle portion of the input rotary shaft so as to be rotated relatively with respect to the input rotary shaft;  
 a pair of output side disks each including an output side inner surface having an arc-shaped section and respectively supported on the periphery of the output cylinder so as to be rotated synchronously with the output cylinder, the output side inner surfaces of the output side disks being respectively opposed to the input side inner surfaces of the input side disks;  
 an output rotation transmission member fixed to the outer peripheral surface of the middle portion of the output cylinder between the two output side disks so as to be concentric with the two output side disks;  
 a plurality of support members interposed respectively between the input side inner surfaces of the input side disks and the output side inner surfaces of the output side disks, the support members each having a pivot shaft that extends in a twisted direction with respect to the input rotary shaft, the support members each disposed swingably with respect to the associated pivot shaft;  
 power rollers each including a peripheral surface formed as a spherically-shaped convex surface and respectively rotatably supported on associated ones of the support members, the peripheral surfaces of the power rollers being contacted with the input side inner surfaces of the input side disks and the output side inner surfaces of the output side disks; and,  
 a rolling bearing disposed between the input side inner surface of at least one of the input side disks and the output side inner surfaces opposed to the input side inner surface so as to be supported in the casing, and rotatably supporting the output cylinder.  
 
   
   
     2. The toroidal continuously variable transmission as set forth in  claim 1 , wherein a pair of rolling bearings respectively disposed between the respective input side inner surfaces of the input side disks and the respective output side inner surfaces of the output side disks rotatably support the two end portions of the output cylinder, and
 the two rolling bearings are an angular contact ball bearing with the directions of respective contact angles thereof differing from each other or a deep groove ball bearing.  
 
   
   
     3. The toroidal continuously variable transmission as set forth in  claim 2 , wherein the output rotation transmission member is an output gear,
 the width of a substantially outer peripheral portion of the output gear is set larger than that of a substantially outside portion of a second gear being meshingly engageable with the output gear and advancing into a position between the outer surfaces of the pair of output side disks, and  
 the axial-direction two end faces of the outer peripheral portion of the output gear are respectively contacted with the outer surfaces of the pair of output side disks.  
 
   
   
     4. The toroidal continuously variable transmission as set forth in  claim 1 , wherein a rolling bearing disposed between one of the input side inner surfaces of the input side disks and the output side inner surfaces of the output side disks opposed to the input side inner surface rotatably supports one end portion of the output cylinder, and
 the rolling bearing is a four point contact ball bearing which includes an outer ring having an outer raceway formed in an inner surface thereof, an inner ring having an inner raceway formed in an outer surface thereof, and a ball rollably interposed between the outer raceway and the inner raceway and also in which the rolling surface of the ball is contacted with the outer raceway and the inner raceway each at two points.  
 
   
   
     5. The toroidal continuously variable transmission as set forth in  claim 4 , wherein the output rotation transmission member is an output gear,
 the width of a substantially outer peripheral portion of the output gear is set larger than that of a substantially outside portion of a second gear being meshingly engageable with the output gear and advancing into a position between the outer surfaces of the pair of output side disks, and  
 the axial-direction two end faces of the outer peripheral portion of the output gear are respectively contacted with the outer surfaces of the pair of output side disks.  
 
   
   
     6. The toroidal continuously variable transmission as set forth in  claim 1 , wherein the output rotation transmission member is an output gear,
 the width of a substantially outer peripheral portion of the output gear is set larger than that of a substantially outside portion of a second gear being meshingly engageable with the output gear and advancing into a position between the outer surfaces of the pair of output side disks, and  
 the axial-direction two end faces of the outer peripheral portion of the output gear are respectively contacted with the outer surfaces of the pair of output side disks.